Update test-manylinux.sh with 18.04 LTS

* Update release instructions to include rc branch

* Fix version , update test-manylinux.sh with 18.04 LTS

* Remove special character from test-manylinux.sh

* Actually include changes to test-manylinux.sh

* Backout RELEASE.md changes from this branch

Author: Ryan P

confluent_kafka/src/confluent_kafka.c

@@ -2187,8 +2187,13 @@ static PyObject *libversion (PyObject *self, PyObject *args) {
 			     rd_kafka_version());
 }
 
+/*
+ * Version hex representation
+ * 0xMMmmRRPP
+ * MM=major, mm=minor, RR=revision, PP=patchlevel (not used)
+ */
 static PyObject *version (PyObject *self, PyObject *args) {
-	return Py_BuildValue("si", "1.0.1", 0x00100100);
+	return Py_BuildValue("si", "1.0.1", 0x01000100);
 }
 
 static PyMethodDef cimpl_methods[] = {

tools/test-manylinux.sh

@@ -99,7 +99,7 @@ function run_all_with_docker {
     [[ ! -z $DOCKER_IMAGES ]] || \
         # LTS and stable release of popular Linux distros.
         # We require >= Python 2.7 to be avaialble (which rules out Centos 6.6)
-        DOCKER_IMAGES="ubuntu:14.04 ubuntu:16.04 ubuntu:17.10 debian:stable centos:7"
+        DOCKER_IMAGES="ubuntu:14.04 ubuntu:16.04 ubuntu:18.04 debian:stable centos:7"
 
 
     _wheels="$wheelhouse/*manylinux*.whl"